ORA-39078: unable to dequeue message for agent string from queue "string"

ORA-39078
ORA-39078: unable to dequeue message for agent string from queue "string"
Cause: The Data Pump"s communication layer was unable to retrieve a message
from the control or status queue. Subsequent messages will detail the problem.
Action: Fix the problem if possible, or contact Oracle Customer Support.
More details : Viste http://www.high-oracle/ora-39078/
More details : Viste http://www.high-oracle/ora-39078/
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